CN1635408A - Direct type backlight module - Google Patents
Direct type backlight module Download PDFInfo
- Publication number
- CN1635408A CN1635408A CN 200310117702 CN200310117702A CN1635408A CN 1635408 A CN1635408 A CN 1635408A CN 200310117702 CN200310117702 CN 200310117702 CN 200310117702 A CN200310117702 A CN 200310117702A CN 1635408 A CN1635408 A CN 1635408A
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- optical mode
- back optical
- diffuser plate
- downward back
- diffraction grating
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Abstract
This invention relates to a straight down aphototropism module, which comprises at least one tube and one diffusion board, wherein the board comprises one surface relative to the tube and the diffusion board is used to diffuse the light beam from tube with a diffraction grating on its surface.
Description
[technical field]
The invention relates to a kind of down straight aphototropism mode set.
[background technology]
Because advantages such as the liquid crystal display utensil is light, thin, power consumption is little are widely used in modernized information equipments such as notebook computer, mobile phone, personal digital assistant.Because LCD itself is not had a characteristics of luminescence, need provide module backlight to realize Presentation Function.Module backlight is divided into two kinds of side-light type module backlight and down straight aphototropism mode set by structure.Wherein, down straight aphototropism mode set is mainly used in fields such as LCD monitor or LCD TV.
As everyone knows, down straight aphototropism mode set need have higher emitting brightness, and its outgoing light homogeneity will reach predetermined demand, thereby promotes color contrast, whole-screen brightness effect and the visible angle of LCD.
A kind of prior art down straight aphototropism mode set sees also No. the 5th, 479,328, the United States Patent (USP) (with reference to Fig. 1) of bulletin on Dec 26 nineteen ninety-five.This down straight aphototropism mode set 10 provides illumination for display panels 20, comprise helical lamp (Serpentine Tube) 12, reflection framework 14, glass substrate 15, be arranged at diffuser plate 17 and blast sheet 18 on the glass substrate 15, this helical lamp 12 is nested in a plurality of passages (not indicating) of reflection framework 14.This blast sheet 18 is relative with display panels 20 by clearance 19.
The prior art direct type backlight module 10 has defective: for reaching the outgoing light homogeneity that meets pre-provisioning request, the design of this reflection framework 14 is comparatively difficult, increases the complexity of down straight aphototropism mode set 10 structures; The complex contour of this helical lamp 12 make comparatively difficulty, and cost is higher.
[summary of the invention]
Down straight aphototropism mode set outgoing light homogeneity in the prior art is low in order to overcome, complex structure, problem that cost is high, the invention provides a kind of outgoing light homogeneity height, simple in structure and down straight aphototropism mode set that cost is low.
The scheme that technical solution problem of the present invention is adopted is: a direct-type backlight module is provided, comprises an at least one fluorescent tube and a diffuser plate, this diffuser plate comprises a surface, and this surface is relative with this fluorescent tube, and wherein, this surface is provided with diffraction grating.
Compared to prior art, the diffuser plate of down straight aphototropism mode set of the present invention is provided with diffraction grating, therefore can adopt common fluorescent tube simple in structure as light source and its, thereby reduce production costs; This diffraction grating can change the light distribution of fluorescent tube emergent light, thereby promotes the outgoing light homogeneity of down straight aphototropism mode set.
[description of drawings]
Fig. 1 is the down straight aphototropism mode set structural representation of prior art.
Fig. 2 is a down straight aphototropism mode set structural representation of the present invention.
Fig. 3 is the floor map that the diffuser plate of Fig. 2 has diffraction grating one side.
Fig. 4 is diffraction grating part enlarged drawing and its diffraction effect synoptic diagram to the fluorescent tube emergent light of Fig. 3.
Fig. 5 is the light path synoptic diagram of down straight aphototropism mode set of the present invention.
[embodiment]
See also Fig. 2, down straight aphototropism mode set 100 of the present invention comprises framework 110, a plurality of fluorescent tube 120, be positioned at the diffuser plate 150 that arc reflecting body 130 and under these a plurality of fluorescent tubes 120 has diffraction grating 151.This fluorescent tube 120 and arc reflecting body 130 are positioned at the zone that framework 110 and diffuser plate 150 are defined, and diffraction grating 151 is arranged on the surface 152 of these diffuser plate 150 relative fluorescent tubes 120.The light of light that fluorescent tube 120 sends and 130 reflections of arc reflecting body converts uniform surface light source to after spreading via diffuser plate 150.
This fluorescent tube 120 is cold cathode fluorescent lamps.The effect of this arc reflecting body 130 is the light that reflectoscope pipe 120 sends, and light is delivered on the diffuser plate 150 as far as possible.Framework 110 is used to accommodate fluorescent tube 120 and arc reflecting body 130, reflects away from framework 110 for preventing light, and the inside surface 111 of this framework 110 forms black print (Black Printing), is used for the diffused light on the absorbing frame 110.
Seeing also Fig. 3, is the distribution plan of diffraction grating 151 on diffuser plate 150 of Fig. 2.This diffraction grating 151 is to be disposed on the surface 152 of this diffuser plate 150, each continuous part of this diffraction grating 151 and this a plurality of fluorescent tubes 120 are corresponding respectively, because the zone of the diffuser plate 150 of fluorescent tube 120 direct irradiations is than other zonal ray intensity height, therefore diffraction grating 151 is set in the stronger zone of light intensity can reduces gap between the light and shade zone, thereby improve the outgoing light homogeneity of diffuser plate 150.
Please consulting Fig. 4 together, is these diffraction grating 151 part enlarged drawings and its diffraction effect synoptic diagram to fluorescent tube 120 emergent lights.This diffraction grating 151 is transmission-type diffraction gratings, and it is set directly on this diffuser plate 150.The grating space a of this diffraction grating is 10 μ m～30 μ m, grating slit opening b is 1 μ m～10 μ m, when the emergent light of fluorescent tube 120 passes through this diffraction grating unit, because Light Diffraction Effect, the following characteristics of its light distribution tool: except that the 0th rank light intensity at center, also have in the light intensity both sides, the 0th rank at center ± 1 rank, ± 2 rank (figure does not show), ± 3 rank (figure does not show) ... the light distribution on ± n rank (figure do not show), i.e. the light distribution of this emergent ray zone along laterally towards about expansion.This diffuser plate 150 adopts transparent piezoelectric to make, this transparent piezoelectric material can be transparent piezoelectric pottery or Kynoar (Polyvinylidene Fluoride, PVDF).This diffraction grating 151 be connected with an external control circuit (figure do not show).Because being added in piezoelectric generation electric field, piezoelectric machinery itself and electrical couplings effect, external voltage will make piezoelectric produce mechanical deformation.When this transparent piezoelectric material was subjected to the added electric field action of external control circuit, its electric dipole moment can be elongated, and this transparent piezoelectric material can extend along direction of an electric field.This diffraction grating 151 will change grating space along with impressed voltage value size, impressed voltage is big more, grating space also can be big more, and its luminous intensity also can be high more, thereby can control light intensity and the uniformity coefficient of voltage swing control through diffuser plate 150 according to actual needs.
Please consult Fig. 5 together, when work, fluorescent tube 120 emits beam, and part light is directly into being incident upon diffuser plate 150, and all the other light are incident to diffuser plate 150 equally after 130 reflections of arc reflecting body.Be incident to diffuser plate 150 after the part light that this diffraction grating 151 is stronger with light intensity spreads, diffuser plate 150 further promotes the uniformity coefficient of emergent lights.
But down straight aphototropism mode set of the present invention can also have the embodiment of other improvement or replacement.This diffraction grating 150 also can adopt an optical thin film with a plurality of diffraction gratings unit to be attached to the respective regions of this diffuser plate 150.But arc reflecting body 130 inside surface plating one deck highly reflecting films layers.This arc reflecting body 130 can be one-body molded with framework 110.
Claims (10)
1. a down straight aphototropism mode set comprises an at least one fluorescent tube and a diffuser plate, and this diffuser plate comprises a surface, and this surface is relative with this fluorescent tube, it is characterized in that: this surface is provided with diffraction grating.
2. downward back optical mode as claimed in claim 1 is characterized in that: this fluorescent tube is the cold cathode fluorescent lamp pipe.
3. downward back optical mode as claimed in claim 1 is characterized in that: this module backlight further comprises an arc reflecting body, and this arc reflecting body is around these a plurality of fluorescent tubes.
4. downward back optical mode as claimed in claim 3 is characterized in that: this module backlight further comprises a framework, and this framework is used to accommodate fluorescent tube and lampshade.
5. downward back optical mode as claimed in claim 3 is characterized in that: inside surface plating one deck reflectance coating of this lampshade.
6. downward back optical mode as claimed in claim 4 is characterized in that: this framework comprises inside surface, and this inside surface forms black print.
7. downward back optical mode as claimed in claim 4 is characterized in that: this lampshade and framework are one-body molded.
8. downward back optical mode as claimed in claim 1 is characterized in that: the material of this diffuser plate is the transparent piezoelectric material.
9. downward back optical mode as claimed in claim 1 is characterized in that: this diffraction grating is to be disposed on the surface of this diffuser plate.
10. downward back optical mode as claimed in claim 1 is characterized in that: this diffraction grating is connected with the external circuit of its mechanical deformation of control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310117702 CN1635408A (en) | 2003-12-27 | 2003-12-27 | Direct type backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310117702 CN1635408A (en) | 2003-12-27 | 2003-12-27 | Direct type backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1635408A true CN1635408A (en) | 2005-07-06 |
Family
ID=34843692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310117702 Pending CN1635408A (en) | 2003-12-27 | 2003-12-27 | Direct type backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1635408A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381904C (en) * | 2004-05-10 | 2008-04-16 | 辅祥实业股份有限公司 | Full run-down type backlight source module of using control of plane function |
| CN101493605B (en) * | 2008-01-24 | 2012-02-01 | 奇美电子股份有限公司 | Backlight module, LCD module and LCD |
| CN106802513A (en) * | 2017-01-23 | 2017-06-06 | 京东方科技集团股份有限公司 | Backlight, the manufacture method of backlight and backlight module |
-
2003
- 2003-12-27 CN CN 200310117702 patent/CN1635408A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381904C (en) * | 2004-05-10 | 2008-04-16 | 辅祥实业股份有限公司 | Full run-down type backlight source module of using control of plane function |
| CN101493605B (en) * | 2008-01-24 | 2012-02-01 | 奇美电子股份有限公司 | Backlight module, LCD module and LCD |
| CN106802513A (en) * | 2017-01-23 | 2017-06-06 | 京东方科技集团股份有限公司 | Backlight, the manufacture method of backlight and backlight module |
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